A copper wire has a diameter of 0.5mm and resistivity of 1.6×10-8 ohm m. (i) what will be the length of worr to make it resistance of 10 ohm
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radius of the wire = 0.05m
R= resistivity* length/ area
10= 1.6*10^-8 * length/ 22/7*0.05
length= 10*22*0.05/1.6*10^-8*7
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